The NetBSD-current/i386 build is working again. The following commits were made between the last failed build and the successful build:
2018.07.09.11.55.45 kre src/external/gpl3/binutils.old/dist/bfd/config.bfd,v 1.6 2018.07.09.11.55.45 kre src/external/gpl3/binutils.old/lib/libbfd/arch/i386/defs.mk,v 1.6 2018.07.09.12.15.31 christos src/external/gpl3/binutils.old/dist/bfd/peXXigen.c,v 1.6 Log files can be found at: http://releng.NetBSD.org/b5reports/i386/commits-2018.07.html#2018.07.09.12.15.31